This contains two new versions of the GaussSeidel and symGaussSeidel smoother which have a better performance on the KNL. The optimisations include swapping a divide in the inner loop for a multication by a pre-calculated reciprocal and creating a separate code path for cells with a different number of faces. These new smoothers can be used instead of the existing ones by compiling and then post-fixing the smoother with “KNL” in the configuration files.
First, source the OpenFOAM environment and, then, simply wmake in this directory. A new library, libKNL.so, will be put in the FOAM_LIBBIN directory.
The additional library will need to be included in the system/controlDict. Here, libKNL.so needs to be appended to the libs list. Next, look in system/fvSolution and replace any occurances of GaussSeidel with GaussSeidelKNL, and symGaussSeidel with symGaussSeidelKNL. Finally, run as usual.